Boring apparatus.



E. W. PISHBURNE. BORING APPARATUS.

APPLICATION FILEDv APR. 3, 1912.

Patented A111229, 1913.

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13. W. PISHBURNE.

BORING APPARATUS.

APPLICATION FILED APR. 3, 1912.

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SARS PATENT FFICE,

EDWARD W. FISHBURNE, OF RICHMOND, VIRGINIA, ASSIGNOR TO RICHMOND STAY- BOLT DRILLING MACHINE MANUFACTURING COMPANY, A" CORPORATION 0F VIR- l GIN IA.

BORING APPARATUS."

Specification of Letters Patent.

Application filed April 3, 1912.

Patented Apr. 29, 1913. serial No. 688,320.

r'o all whom it may concern Be it known that I, EDWARD W. FISH- BURNE, a citizen of the United States, residing at Richmond, in the county of IIenrico and State of Virginia, have invented certain new and useful Improvements in Boring Apparatus, of which the following is a specification, reference being had to the accompanying drawings.

This invention comprehends certain new and useful improvements in boring apparat-us for the use of electricians, carpenters, gas-litters, plumbers, steam-fitters and other workmen, and the invention has for its primary object a simple, durable and efficient construction of boring apparatus which will be found of universal application', the device being so arranged that it may be easily operated to bore a double line of holes in a joist at one operation, or by a simple adjustment of the parts used as a single bit universal attachment capable of being operated at an elevation with the operator standing on the ioor and with the bit disposed at any desired angle.

The invent-ion also has for its object a boring machine of this character in which provision is made for varying the distance between the spindles of the two-spindle attachment, whereby the holes may be bored at different distances apart at a single operation.

A further object of t-he invention is a device of this type, embodying improved means for feeding the bits into the work by an improved construction and arrangement of feed cord, whereby the operator may back the feed rod against a joist adjoining the one being operated upon and force the bits through, thereby rendering easy the operation of withdrawing or backing out the bits.

A still further object of the invention is, in a boring' machine of the character above outlined, an improved construction and arrangement of yielding feed rod which may be easily operated with the operator standing on the iioor and the bits boring at a considerable elevation.

The invention also has for its object a universal bit attachment, the parts of which are so constructed and arranged that the bit may be operated at a considerable elevation at any angle or, by a simple and easy adjustment and interchanging of parts, be used as a hand drill. And the invention also aims to generally improve devices of this class and to render them more useful and commercially desirable.

With these land other objects in view, as will more fully appear as the description proceeds, the invention consists in certain constructions, arrangements and combinations of the parts that I shall hereinafter fully describe and claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings in whic Figure l is an eleva-tion of one form or embodiment of my invention, the main supporting bar being shown broken away in order to save space. Fig. 2 is a partial section and a partial elevation of the machine. Fig. 3 is a top plan view of the head on a somewhat larger scale. Fig. i is a detail transverse section on the line 4 4 of Fig. 3, parts being shown in elevation. Fig. 5 is a detail horizontal sectional view, the section being taken on the line 55, of Fig. 2. Fig. 6 is an elevation of the universal bit attachment of the machine as used for boring joists or in other elevated positions. Fig. 7 is a view at right angles to Fig. 6, and, Fig. 8 is a side view arranged as a hand or breast drill with the single bit universal attachment.

Corresponding and like parts are referred to in the following description and desig# nated in the accompanying drawings by like reference characters.

In that embodiment of my invention illustrated in Figs. 1 to 5, inclusive, the numeral l designates the main upright or supporting bar of the device which is formed on one edge with a longitudinally extending groove 2 designed to receive an extension member 3 which is adjustably connected to the supporting bar l, as by ametallic strap 4 clamped around the bar and secured thereon by means of a tie bolt 5. The lower end of the extension member 3 which is designed to rest against the floor when boring joists or the like, is preferably pointed, as indicated at 6, so as to secure a firm hold. At this point, it will bel understood that by vertically adjusting the extension member 3, the

supporting bar 1"may be held at different heights, according to the particular work in hand.

On the upper end of the supporting bar 1 which is preferably 'in the form of a wooden beam of any desired length, width and thickness, is a metallic strap 7 secured thereto by screws or similar fastening de vices, said strap having secured to it and projecting upwardly from it and from the upper end of the bar, a post or stud 8 upon which a sleeve 9 is mounted, said sleeve loeing secured in different axial adjustments upon the stud by means of a set screw l0, as indicated in Fig. 1. The sleeve 9 preferably forms an integral part of a casting 11 which formed with a horizontally disposed journal bearing 12 in which a tubular shaft 13l is journaled, said shaft being also journaled in parallel and laterally spaced plates 14 which form the main supporting parts of the head A of the device. These plates 14 are hel-d secured together in spaced relation by means of tie bolts 15 and interposed spacing thimbles 16 surrounding said bolts. In order to securely hold the head in the required position upon the casting 11, said casting is formed with a flared upper end 17 which is provided with a curved slot 18, and a clamping screw 19 is accommodated in said slot and secured to a lug 20 which is formed on and which projects upwardly from the upper edge o-f one of the plates 14.

Mounted between the plates 14 and keyed or otherwise secured to the tubular shaft 13, is a drive sprocket 21, underneath which a sprocket chain 22 passes in engagement therewith. This chainalso passes in opposite directions and thence downwardly over sprocket wheels 23 and around an idler pulley 24 which is j ournaled on a laterally projecting stub axle 25 held in different vertically adjusted positions with-in a vertical slot 26 which is formed in a bar 27 depending from one of the sid-e plates 14, as best illustrated in Fig. 2. The sprocket wheels 23 are pinned, keyed or otherwise secured to the bit spindles 28 which are journaled in the plates 14 and which are carried by longitudinally adjustable bearings that are mounted in slots 29 formed in the plates 14. Each of these bearings in the present instance is composed of an inner abutment member 30 and a jam nut 31, whereby the spindles 28 may be adjusted toward or from each other and the dist-ance between the two holes that are bored at a single operation thereby varied. T o compensate for this longitudinal adjustment of the spindles 28 toward or away from each other, and the co-nsequent slackening and extension of the sprocket chain 22, the tensioning pulley 24 hereinbefore mentioned is provided, so that if the spindles 28 are moved toward each other, the pulley 24 may be moved downwardly and held at a lower point of adjustment relative to the slot 26, and whereby when the spindles 28 are moved away from each other, the pulley 24 may be correspondingly raised.

To drive the tubular shaft 13 and through it also simultaneously drive the two bit-carrying spindles 28, I mount on the laterally projecting end of the shaft 13, a sprocket wheel 32 keyed or otherwise secured thereto, and I pass around saidv sprocket wheel a sprocket chain 33, the stretches of which eX- tend downwardly and around an idler pul ley 34 which is carried by t-he lateral eXtension 35 of the tie bolt 5, both stretches of the chain which are substantially vertically disposed, being within convenient reach of the operator, whereby he may pull downwardly upon the chain and rotate the shaft 13 and its driven parts in either direction, as desired. At this point, it will be noted with particular reference to Figs. 2 and 5, that the strap 4 subserves a double function, in that it not only provides for rigidly connecting the extension member 3 to the supporting bar l in different vertically adjusted positions, but it also serves as the journal support for the idler or pulley 34.

In order to feed the bits that are carried by the spindles 28 positively forward so as to insure the formation of clean and clear cut holes, I have provided a feed rod 36 which is designed to be inserted through the tubular shaft 13 and abut at its rear end against a joist neXt to the one being operated upon, a set collar 37 being mounted on said feed rod and preventing the accidental detachment thereof. rIhe forward end of the feed rod 36 is formed with an eye 38 and is encircled by a coiled expansion spring 39 which bears at one end against said eye and which reacts against the outer face of the adjacent plate 14, and to move the entire apparatus forwardly relative to the feed rod 36 against the tension of the spring 39, a pull cord 40 is secured at one end to said eye, said cord passing rearwardly through the slot 26 before mentioned and downwardly around a pulley 41 which is journaled in the casting 11 just above the sleeve 9. The other end of the cord passes down within easy reach of the operators hand and is provided with a hand grip or handle 42, as best illustrated in Figs. 1 and 2.

From as much of the description as has preceded, in connection. with the correlated views of the accompanying drawings, it will be understood that in the practical use of the apparatus for boring a double rowv of holes in a joist or other elevated work, the extension member 3 is set at the required adjustment to bring the head A at the proper elevation and the pointed rear eX- tremity of the feed rod 36 is placed in contact with the side of the j oist neXt to the one to be operated upon. By pulling downwardly upon either stretch of the sprocket chain 33, the tubular drive shaft 13 may be rotated in one direction or the reverse and consequently, the bit-carrying spindles 28 will be simultaneously rotated and the bits forced into and through the work, the operator at the same time pulling downwardly upon the cord 40 and at all times maintaining the required pressure to insure the proper feeding of the bits into the work and the formation of clean and clear cut holes.

Vhere it is desired to use a single bit attachment in an elevated position with a universally adjustable spindle, the apparatus is arranged, as illustrated in Figs. 6 and 7. Instead of the head A hereinbefore described and shown in Figs. 1, 2 and 3, I use in connection with the supporting bar 1 and casting 11, with its tubular bearing 12, a bracket 43 which is formed with parallel arms 44 provided at their ends with bearings 45 for a bit-carrying spindle.46. The spindle 46 has a bevel pinion 47 fixed thereon, said pinion meshing with a corresponding pinion 48 which is secured to a shaft 49 journaled in the bracket 43 and bearing 12, a sprocket Wheel 50 being secured to the protruding end of the shaft 49 and a chain 51 arranged like the chain 33 being passed around said sprocket wheel, whereby the operator may by pulling upon said shaft, turn the spindle 4G in the required direction. The bracket 43 is formed with laterally extending arms 52, either one or both of which may carry a clamping bolt 53 accommodated in the curved slot 18 of the flared upper end 17 of the casting 11, whereby the bracket 43 may be turned to different positions and the bit operated in a true vertical position or at any desired angle or inclination.

When it is desired to use the universal bit attachment as a breast or manually supported drill or boring device, a hand grip 54 is secured by a taper pin or the like within the sleeve 9 of the casting 11, the sprocket wheel 50 is stripped from the shaft 49 and on the preferably reduced end 49"L of said shaft, a crank handle 55 is secured, as illustrated in Fig. 8.

lhile the accompanying drawings illustrate what I believe to be the preferred embodiment of my invention, it is to be understood that the invention is not limited thereto, but that various changes may be made in the-construction, arrangement and proportions of the parts without departing from the scope of the invention, as defined in the appended claims.

Having thus described the invention, what is claimed is 1. A boring apparatus, including a supporting bar, an extension member therefor provided with a foot, a strap adapted to clamp the extension member to the supporting bar at different adjustments, a tie bolt connected to said strap and having an eX- tended end, an idler mounted on said end, boring devices carried by said bar, and an actuating chain for said boring devices passing around said idler.

2. A boring apparatus of the character described, including a supporting bar, a head mounted thereon, bit carrying spindles carried by said head, a tubular drive shaft journaled in the head between said spindles, manually operable means connected to said drive shaft for turning the same, driving connections between said shaft and said spindles, and a feed rod movablethrough said drive shaft, for the purpose specified.

3. A boring apparatus of the character described, including a supporting bar, a head carried thereby, bit carrying spindles mounted in the head, a tubular drive shaft journaled in the head between said spindles, driving connections from said drive shaft to said spindles, means for rotating said drive shaft, a feed bar movable through said tubular drive shaft, and manually operable means extending down along the supporting bar and connected to said feed rod, for the purpose specified.

4. A boring apparatus of the character described, including a supporting bar, a head carried thereby, bit carrying spindles journaled in said head, a tubular drive shaft journaled in the head, driving connections from said drive shaft to said spindles, means for rotating said drive shaft, a pulley carried by th'e head underneath said drive shaft, a feed rod movable through said drive shaft and head, and a pull cord connected to one end of said feed rod and passing downwardly over said pulley.

5. A boring apparatus of the character described, including a supporting bar, a head carried thereby, bit carrying spindles journaled in the head, a tubular drive shaft journaled in the head between said spindles, sprocket wheels connected to said spindles, a sprocket wheel mounted on the drive shaft, a chain extending around said sprocket wheels, another sprocket wheel mounted on the drive shaft, a sprocket chain extending around said last named sprocket wheel and arranged for manual actuation at a point on the supporting bar below said head, a'feed rod movable through the head and tubular drive shaft, the head being provided below said drive shaft with a pulley, and a pull cord connected to said feed rod and extending downwardly over said pulley.

6, A portable boring apparatus, including a casting formed with a journal bearing and provided with a flared end formed with a curved slot concentric to the journal bearing and extending equally on both sides of the'vertical center of said journal bearing, a drive shaft mounted in said bearing, a bit spindle, a support in which said spindle is journaled7 an operative driving connection from the drive shaft to the bit spindle,

10 in said slot, whereby it will hold the support and its spindle in diiierent adjusted positions, a sprocket Wheel on one end of said drive shaft, a manually operable chain eX- tendng around said drive shaft, and an upright on the upper end of which the casting is supported, the chain extending down along the upright.

In testimony Whereoi:l I hereunto aiiix my signature in the presence of two Witnesses.

EDVARD W. FISHBURNE.

Witnesses:

HELEN LIGGAN, WV. J. GARNER.

Copies of ythis patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washingtom D. C. 

